[la-plas] 
| Pierre Si⋅mon [pyer see-mawn] Marquis de, 1749–1827, French astronomer and mathematician. |
| Laplace (lə-pläs', lä-) Pronunciation Key
French mathematician and astronomer noted for his theory of a nebular origin of the solar system and his investigations into gravity and the stability of planetary motion. He also made important contributions to the theory of probability. |